SU-E-J-40: Lung Lesion Tracking Using Fixed-Spaced Non-Migrating Fiducial Markers in Robotic Radiosurgery

Medical Physics
J GershM DeWeese

Abstract

With lung lesion treatment being a major indication of the use of the CyberKnife (CK) robotic radiosurgery system (Accuray Inc, Sunnyvale, CA), the ability for the CK's stereoscopic kV imaging system to accurately track implanted fiducial markers becomes vital in the accurate delivery of therapeutic radiation. This study examines a novel fixed-space fiducial marker delivery system which is capable of delivering two VISICOIL (IBA Dosimetry America, Memphis, TN) non-migrating fiducial markers simultaneously at a fixed spacing through a single 20-gauge needle. More specifically, presented herein is a preliminary study which tests the CK'streatment localization system's (TLS) ability to track markers of varying size and spacing, comparing subsequent stereoscopic kV imaging to DRR's generated during the planning stages. Three markers were placed in an XLT Lung Phantom (CIRS Inc, Norfolk, VA); two markers inserted along a diagonal line in a coronal plane, separated by biocompatible spacersof varying size, and a common third marker being placed in a non-varyinglocation in a coronal plane anterior to the marker pair. This third marker allows the calculation of rotational and translation corrections. Differentcombinations were scanned, ...Continue Reading

Citations

Jun 26, 2020·Advanced Healthcare Materials·Eric ParigorisShuichi Takayama

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